*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --brand: #e5282a;
      --brand-dark: #b91c1e;
      --brand-light: #ff5557;
      --accent: #ff8c00;
      --dark: #0d0d0d;
      --dark-2: #141414;
      --dark-3: #1e1e1e;
      --dark-4: #2a2a2a;
      --text: #f0f0f0;
      --text-muted: #888;
      --text-dim: #555;
      --radius: 16px;
      --radius-sm: 10px;
    }

    html { scroll-behavior: smooth; }

    body {
      font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
      background: var(--dark);
      color: var(--text);
      line-height: 1.6;
      overflow-x: hidden;
    }

    /* ─── 工具 ─── */
    .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
    .tag {
      display: inline-flex; align-items: center; gap: 6px;
      background: rgba(229,40,42,.12); border: 1px solid rgba(229,40,42,.3);
      color: var(--brand-light); border-radius: 100px;
      padding: 4px 14px; font-size: 13px; font-weight: 500;
    }
    .tag::before { content: ''; display: block; width: 6px; height: 6px; border-radius: 50%; background: var(--brand-light); animation: pulse 2s infinite; }
    @keyframes pulse { 0%,100%{opacity:1}50%{opacity:.4} }

    /* ─── 导航 ─── */
    header {
      position: fixed; top: 0; left: 0; right: 0; z-index: 999;
      backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
      background: rgba(13,13,13,.8);
      border-bottom: 1px solid rgba(255,255,255,.06);
      transition: all .3s;
    }
    nav {
      display: flex; align-items: center; justify-content: space-between;
      height: 64px;
    }
    .logo {
      display: flex; align-items: center; gap: 10px;
      font-size: 20px; font-weight: 700; text-decoration: none; color: var(--text);
    }
    .logo-icon {
      width: 36px; height: 36px; border-radius: 10px;
      background: linear-gradient(135deg, var(--brand), var(--accent));
      display: flex; align-items: center; justify-content: center;
      font-size: 18px;
    }
    .nav-links {
      display: flex; align-items: center; gap: 32px; list-style: none;
    }
    .nav-links a {
      text-decoration: none; color: var(--text-muted); font-size: 14px;
      transition: color .2s;
    }
    .nav-links a:hover { color: var(--text); }
    .btn-primary {
      display: inline-flex; align-items: center; gap: 8px;
      background: linear-gradient(135deg, var(--brand), var(--brand-dark));
      color: #fff; border: none; border-radius: 100px;
      padding: 10px 24px; font-size: 14px; font-weight: 600;
      cursor: pointer; text-decoration: none; transition: all .2s;
      box-shadow: 0 4px 20px rgba(229,40,42,.35);
    }
    .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(229,40,42,.5); }
    .btn-secondary {
      display: inline-flex; align-items: center; gap: 8px;
      background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12);
      color: var(--text); border-radius: 100px;
      padding: 10px 24px; font-size: 14px; font-weight: 500;
      cursor: pointer; text-decoration: none; transition: all .2s;
    }
    .btn-secondary:hover { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.2); }

    /* ─── Hero ─── */
    .hero {
      min-height: 100vh; display: flex; align-items: center;
      padding: 120px 0 80px;
      position: relative; overflow: hidden;
    }
    .hero-bg {
      position: absolute; inset: 0; pointer-events: none;
    }
    .hero-bg .glow-1 {
      position: absolute; top: -200px; left: -200px;
      width: 700px; height: 700px; border-radius: 50%;
      background: radial-gradient(circle, rgba(229,40,42,.18) 0%, transparent 70%);
      animation: float 8s ease-in-out infinite;
    }
    .hero-bg .glow-2 {
      position: absolute; bottom: -150px; right: -100px;
      width: 500px; height: 500px; border-radius: 50%;
      background: radial-gradient(circle, rgba(255,140,0,.12) 0%, transparent 70%);
      animation: float 10s ease-in-out infinite reverse;
    }
    .hero-bg .grid {
      position: absolute; inset: 0;
      background-image: linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px),
                        linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px);
      background-size: 60px 60px;
    }
    @keyframes float { 0%,100%{transform:translateY(0)}50%{transform:translateY(-30px)} }

    .hero-content {
      position: relative; z-index: 1;
      display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center;
    }
    .hero-title {
      font-size: clamp(40px, 5vw, 64px); font-weight: 900;
      line-height: 1.15; margin: 20px 0 24px;
    }
    .hero-title .highlight {
      background: linear-gradient(135deg, var(--brand-light), var(--accent));
      -webkit-background-clip: text; -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-desc {
      font-size: 17px; color: var(--text-muted); line-height: 1.8;
      margin-bottom: 36px;
    }
    .hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
    .hero-stats {
      display: flex; gap: 36px; margin-top: 48px; padding-top: 36px;
      border-top: 1px solid rgba(255,255,255,.07);
    }
    .stat-item { display: flex; flex-direction: column; }
    .stat-num {
      font-size: 28px; font-weight: 700;
      background: linear-gradient(135deg, #fff, rgba(255,255,255,.6));
      -webkit-background-clip: text; -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .stat-label { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

    /* 右侧展示卡 */
    .hero-visual {
      position: relative;
    }
    .video-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
    }
    .video-card {
      background: var(--dark-3); border-radius: var(--radius);
      border: 1px solid rgba(255,255,255,.07);
      overflow: hidden; position: relative;
      aspect-ratio: 9/16; cursor: pointer;
      transition: transform .3s, border-color .3s;
    }
    .video-card:hover { transform: scale(1.03); border-color: rgba(229,40,42,.4); }
    .video-card:nth-child(1) { margin-top: 32px; }
    .video-card:nth-child(4) { margin-top: -32px; }
    .video-card video {
      position: absolute; inset: 0; width: 100%; height: 100%;
      object-fit: cover; border-radius: inherit;
      display: block;
    }
    .video-card-label {
      position: absolute; bottom: 10px; left: 50%; transform: translateX(-50%);
      font-size: 12px; color: #fff; font-weight: 600; white-space: nowrap;
      background: rgba(0,0,0,.55); backdrop-filter: blur(6px);
      padding: 4px 10px; border-radius: 100px;
    }
    .video-card-badge {
      position: absolute; top: 10px; left: 10px;
      background: linear-gradient(135deg, var(--brand), var(--brand-dark));
      color: #fff; font-size: 10px; font-weight: 700;
      padding: 3px 8px; border-radius: 100px;
    }
    .play-btn {
      position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
      width: 48px; height: 48px; border-radius: 50%;
      background: rgba(229,40,42,.9); backdrop-filter: blur(8px);
      display: flex; align-items: center; justify-content: center;
      opacity: 1; transition: opacity .25s;
      pointer-events: none;
    }
    .play-btn svg { width: 20px; height: 20px; fill: #fff; margin-left: 3px; }
    .video-card.playing .play-btn { opacity: 0; }

    /* ─── 视频模态框 ─── */
    .video-modal-overlay {
      position: fixed; inset: 0; z-index: 2000;
      background: rgba(0,0,0,.88); backdrop-filter: blur(10px);
      display: flex; align-items: center; justify-content: center;
      opacity: 0; pointer-events: none; transition: opacity .25s;
    }
    .video-modal-overlay.open { opacity: 1; pointer-events: all; }
    .video-modal-box {
      position: relative; max-width: min(420px, 90vw);
      border-radius: 20px; overflow: hidden;
      box-shadow: 0 32px 80px rgba(0,0,0,.7);
      transform: scale(.92); transition: transform .25s;
    }
    .video-modal-overlay.open .video-modal-box { transform: scale(1); }
    .video-modal-box video {
      display: block; width: 100%; max-height: 85vh;
      object-fit: contain; background: #000;
    }
    .video-modal-close {
      position: absolute; top: 12px; right: 12px;
      width: 36px; height: 36px; border-radius: 50%;
      background: rgba(0,0,0,.6); backdrop-filter: blur(6px);
      border: none; color: #fff; font-size: 20px; line-height: 1;
      cursor: pointer; display: flex; align-items: center; justify-content: center;
      transition: background .2s;
    }
    .video-modal-close:hover { background: rgba(229,40,42,.8); }

    /* ─── 功能特性 ─── */
    section { padding: 100px 0; }
    .section-header { text-align: center; margin-bottom: 64px; }
    .section-title {
      font-size: clamp(28px, 4vw, 44px); font-weight: 800;
      margin: 16px 0 20px;
    }
    .section-desc { font-size: 16px; color: var(--text-muted); max-width: 560px; margin: 0 auto; }

    .features-grid {
      display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
    }
    .feature-card {
      background: var(--dark-2); border-radius: var(--radius);
      border: 1px solid rgba(255,255,255,.06);
      padding: 28px 24px; position: relative; overflow: hidden;
      transition: all .3s; cursor: default;
    }
    .feature-card::before {
      content: ''; position: absolute; inset: 0;
      background: linear-gradient(135deg, rgba(229,40,42,.06), transparent);
      opacity: 0; transition: opacity .3s;
    }
    .feature-card:hover { border-color: rgba(229,40,42,.25); transform: translateY(-4px); }
    .feature-card:hover::before { opacity: 1; }
    .feature-icon {
      width: 52px; height: 52px; border-radius: 14px;
      display: flex; align-items: center; justify-content: center;
      font-size: 26px; margin-bottom: 18px;
    }
    .feature-name { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
    .feature-desc { font-size: 13px; color: var(--text-muted); line-height: 1.7; }
    .feature-tag {
      display: inline-block; margin-top: 12px;
      background: rgba(229,40,42,.1); color: var(--brand-light);
      font-size: 11px; padding: 2px 8px; border-radius: 100px; font-weight: 600;
    }

    /* 功能颜色主题 */
    .fi-red   { background: rgba(229,40,42,.15); }
    .fi-orange{ background: rgba(255,140,0,.15); }
    .fi-blue  { background: rgba(56,143,255,.15); }
    .fi-purple{ background: rgba(139,92,246,.15); }
    .fi-green { background: rgba(34,197,94,.15);  }
    .fi-pink  { background: rgba(236,72,153,.15); }
    .fi-teal  { background: rgba(20,184,166,.15); }
    .fi-yellow{ background: rgba(234,179,8,.15);  }

    /* ─── 工作流程 ─── */
    .workflow { background: var(--dark-2); border-top: 1px solid rgba(255,255,255,.05); border-bottom: 1px solid rgba(255,255,255,.05); }
    .steps-row {
      display: flex; align-items: flex-start; gap: 0;
      position: relative;
    }
    .steps-row::before {
      content: ''; position: absolute; top: 28px; left: calc(40px + 16px);
      right: calc(40px + 16px); height: 1px;
      background: linear-gradient(90deg, transparent, rgba(229,40,42,.4), transparent);
    }
    .step-item {
      flex: 1; text-align: center; padding: 0 16px;
      display: flex; flex-direction: column; align-items: center; gap: 16px;
    }
    .step-num {
      width: 56px; height: 56px; border-radius: 50%;
      background: linear-gradient(135deg, var(--brand), var(--brand-dark));
      color: #fff; font-size: 20px; font-weight: 800;
      display: flex; align-items: center; justify-content: center;
      position: relative; z-index: 1;
      box-shadow: 0 0 0 8px var(--dark-2);
    }
    .step-title { font-size: 16px; font-weight: 700; }
    .step-desc { font-size: 13px; color: var(--text-muted); line-height: 1.7; }

    /* ─── 优势亮点 ─── */
    .highlights-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
    }
    .highlight-card {
      background: var(--dark-2); border-radius: var(--radius);
      border: 1px solid rgba(255,255,255,.06); padding: 36px;
      display: flex; gap: 24px; align-items: flex-start;
      transition: all .3s;
    }
    .highlight-card:hover { border-color: rgba(229,40,42,.2); background: var(--dark-3); }
    .highlight-icon {
      width: 56px; height: 56px; flex-shrink: 0; border-radius: 16px;
      background: linear-gradient(135deg, var(--brand), var(--brand-dark));
      display: flex; align-items: center; justify-content: center;
      font-size: 26px;
    }
    .highlight-body h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
    .highlight-body p { font-size: 14px; color: var(--text-muted); line-height: 1.8; }

    /* ─── 定价 ─── */
    .pricing { background: var(--dark-2); border-top: 1px solid rgba(255,255,255,.05); border-bottom: 1px solid rgba(255,255,255,.05); }
    .pricing-cards {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    }
    .pricing-card {
      background: var(--dark); border-radius: var(--radius);
      border: 1px solid rgba(255,255,255,.07);
      padding: 36px; position: relative; transition: all .3s;
    }
    .pricing-card.featured {
      border-color: rgba(229,40,42,.4);
      background: linear-gradient(160deg, rgba(229,40,42,.06), var(--dark));
    }
    .pricing-card:hover { transform: translateY(-6px); }
    .pricing-badge {
      position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
      background: linear-gradient(135deg, var(--brand), var(--accent));
      color: #fff; font-size: 12px; font-weight: 700;
      padding: 4px 16px; border-radius: 100px;
    }
    .pricing-name { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
    .pricing-price {
      margin: 20px 0;
      display: flex; align-items: flex-end; gap: 4px;
    }
    .price-amount { font-size: 48px; font-weight: 900; line-height: 1; }
    .price-unit { font-size: 14px; color: var(--text-muted); padding-bottom: 8px; }
    .pricing-desc { font-size: 13px; color: var(--text-muted); margin-bottom: 24px; }
    .pricing-features { list-style: none; margin-bottom: 32px; }
    .pricing-features li {
      font-size: 14px; color: var(--text-muted); padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,.04);
      display: flex; align-items: center; gap: 8px;
    }
    .pricing-features li::before { content: '✓'; color: var(--brand-light); font-weight: 700; }
    .btn-full { width: 100%; justify-content: center; }

    /* ─── 常见问题 ─── */
    .faq-list { max-width: 760px; margin: 0 auto; }
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,.07);
      overflow: hidden;
    }
    .faq-question {
      width: 100%; background: none; border: none; color: var(--text);
      font-family: inherit; font-size: 16px; font-weight: 600;
      padding: 24px 0; text-align: left; cursor: pointer;
      display: flex; justify-content: space-between; align-items: center; gap: 16px;
      transition: color .2s;
    }
    .faq-question:hover { color: var(--brand-light); }
    .faq-question .icon {
      width: 28px; height: 28px; border-radius: 50%; flex-shrink: 0;
      background: rgba(255,255,255,.06); display: flex; align-items: center;
      justify-content: center; font-size: 18px; transition: transform .3s, background .2s;
    }
    .faq-item.open .faq-question .icon {
      transform: rotate(45deg); background: rgba(229,40,42,.2);
    }
    .faq-answer {
      font-size: 14px; color: var(--text-muted); line-height: 1.8;
      max-height: 0; overflow: hidden; transition: max-height .4s ease, padding .3s;
    }
    .faq-item.open .faq-answer { max-height: 200px; padding-bottom: 20px; }

    /* ─── 微信咨询浮动按钮 ─── */
    .wx-float {
      position: fixed; right: 24px; bottom: 80px; z-index: 998;
      display: flex; flex-direction: column; align-items: center; gap: 6px;
      cursor: pointer;
    }
    .wx-float-btn {
      width: 52px; height: 52px; border-radius: 50%;
      background: linear-gradient(135deg, #07c160, #05a34f);
      display: flex; align-items: center; justify-content: center;
      box-shadow: 0 4px 20px rgba(7,193,96,.45);
      transition: transform .2s, box-shadow .2s;
      font-size: 26px;
    }
    .wx-float:hover .wx-float-btn { transform: scale(1.1); box-shadow: 0 8px 28px rgba(7,193,96,.6); }
    .wx-float-tip {
      font-size: 11px; color: #fff; background: rgba(0,0,0,.5);
      backdrop-filter: blur(6px); padding: 3px 8px; border-radius: 100px;
      white-space: nowrap;
    }
    .wx-popup {
      position: fixed; right: 88px; bottom: 72px; z-index: 999;
      background: var(--dark-2); border: 1px solid rgba(255,255,255,.1);
      border-radius: 20px; padding: 20px;
      box-shadow: 0 20px 60px rgba(0,0,0,.6);
      display: none; flex-direction: column; align-items: center; gap: 12px;
      width: 200px;
    }
    .wx-popup.show { display: flex; animation: popIn .2s ease; }
    @keyframes popIn { from{opacity:0;transform:scale(.9) translateX(10px)} to{opacity:1;transform:scale(1) translateX(0)} }
    .wx-popup img { width: 160px; height: 160px; border-radius: 12px; display: block; }
    .wx-popup-title { font-size: 14px; font-weight: 700; }
    .wx-popup-sub { font-size: 12px; color: var(--text-muted); text-align: center; line-height: 1.6; }
    .wx-popup-arrow {
      position: absolute; right: -8px; bottom: 28px;
      width: 0; height: 0;
      border-top: 8px solid transparent;
      border-bottom: 8px solid transparent;
      border-left: 8px solid var(--dark-2);
    }

    /* ─── 联系咨询区 ─── */
    .contact-section { background: var(--dark-2); border-top: 1px solid rgba(255,255,255,.05); border-bottom: 1px solid rgba(255,255,255,.05); }
    .contact-inner {
      display: flex; align-items: center; justify-content: space-between;
      gap: 64px;
    }
    .contact-left { flex: 1; }
    .contact-left .tag { margin-bottom: 16px; }
    .contact-left h2 { font-size: clamp(26px, 3.5vw, 40px); font-weight: 800; margin-bottom: 16px; }
    .contact-left p { font-size: 15px; color: var(--text-muted); line-height: 1.9; margin-bottom: 28px; }
    .contact-steps { display: flex; flex-direction: column; gap: 14px; }
    .contact-step {
      display: flex; align-items: center; gap: 14px;
      background: var(--dark-3); border-radius: var(--radius-sm);
      padding: 14px 18px; border: 1px solid rgba(255,255,255,.06);
    }
    .contact-step-num {
      width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0;
      background: linear-gradient(135deg, var(--brand), var(--brand-dark));
      color: #fff; font-size: 14px; font-weight: 700;
      display: flex; align-items: center; justify-content: center;
    }
    .contact-step-text { font-size: 14px; color: var(--text-muted); }
    .contact-step-text strong { color: var(--text); }
    .contact-right {
      display: flex; flex-direction: column; align-items: center; gap: 16px;
      flex-shrink: 0;
    }
    .qr-card {
      background: #fff; border-radius: 20px;
      padding: 16px; box-shadow: 0 12px 40px rgba(0,0,0,.4);
      display: flex; flex-direction: column; align-items: center; gap: 12px;
    }
    .qr-card img { width: 200px; height: 200px; display: block; border-radius: 8px; }
    .qr-card-label {
      font-size: 13px; color: #333; font-weight: 600;
      display: flex; align-items: center; gap: 6px;
    }
    .qr-card-label .wx-dot { color: #07c160; font-size: 18px; }
    @media (max-width: 900px) {
      .contact-inner { flex-direction: column; align-items: flex-start; }
      .wx-float { right: 16px; bottom: 64px; }
    }

    /* ─── CTA ─── */
    .cta-section {
      text-align: center; padding: 120px 0;
      position: relative; overflow: hidden;
    }
    .cta-section .glow-center {
      position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
      width: 800px; height: 400px;
      background: radial-gradient(ellipse, rgba(229,40,42,.15) 0%, transparent 70%);
      pointer-events: none;
    }
    .cta-title { font-size: clamp(32px, 5vw, 56px); font-weight: 900; margin: 16px 0 20px; }
    .cta-desc { font-size: 16px; color: var(--text-muted); margin-bottom: 40px; }
    .cta-actions { display: flex; gap: 16px; justify-content: center; }

    /* ─── 页脚 ─── */
    footer {
      border-top: 1px solid rgba(255,255,255,.06);
      padding: 48px 0;
    }
    .footer-inner {
      display: flex; align-items: center; justify-content: space-between; gap: 24px;
      flex-wrap: wrap;
    }
    .footer-copy { font-size: 13px; color: var(--text-dim); }
    .footer-copy a { color: var(--text-dim); text-decoration: none; }
    .footer-copy a:hover { color: var(--text-muted); }
    .footer-links { display: flex; gap: 24px; }
    .footer-links a { font-size: 13px; color: var(--text-dim); text-decoration: none; }
    .footer-links a:hover { color: var(--text-muted); }

    /* ─── 响应式 ─── */
    @media (max-width: 900px) {
      .hero-content { grid-template-columns: 1fr; gap: 48px; }
      .hero-visual { display: none; }
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .highlights-grid { grid-template-columns: 1fr; }
      .pricing-cards { grid-template-columns: 1fr; }
      .steps-row { flex-direction: column; }
      .steps-row::before { display: none; }
    }
    @media (max-width: 600px) {
      .features-grid { grid-template-columns: 1fr; }
      .nav-links { display: none; }
    }

    /* ─── 滚入动画 ─── */
    .fade-up {
      opacity: 0; transform: translateY(30px);
      transition: opacity .7s ease, transform .7s ease;
    }
    .fade-up.visible { opacity: 1; transform: translateY(0); }